This name is a synonym of Symphyotrichum oblongifolium (Nutt.) G.L.Nesom.
The record derives from TICA
(data supplied on 2012-02-11)
which reports it as a synonym (record 5A57245D-EAF4-42DE-B7A9-872E9A8C86D9) with original publication details: 179 1884.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:23848-2.
This name was in version 1 of The Plant List, record gcc-57544.